| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 04/11/2002 | WO2002029196A2 Improved well testing system |
| 04/11/2002 | US20020040788 Expandable lockout apparatus for a subsurface safety valve and method of use |
| 04/11/2002 | US20020040785 Gas operated pump for use in a wellbore |
| 04/10/2002 | EP1000220B1 Bypass valve closing means |
| 04/10/2002 | CN2485417Y Hydraulic connecting valve |
| 04/10/2002 | CN2485416Y Switch on tubing bottom |
| 04/10/2002 | CN2485415Y Separated layer testing switch for oil pumping well |
| 04/10/2002 | CN1082603C Swivel joint device |
| 04/09/2002 | US6367546 Ceramic components for high pressure oil wells |
| 04/04/2002 | WO2001077480A3 Apparatus to actuate downhole tool |
| 04/02/2002 | US6364037 Apparatus to actuate a downhole tool |
| 04/02/2002 | US6364023 Downhole actuator, and a flow rate adjuster device using such an actuator |
| 04/02/2002 | CA2221770C Apparatus for passive removal of subsurface contaminants |
| 03/28/2002 | WO2001073254A3 Coupling means for controls bridge through a tubing head |
| 03/28/2002 | WO2001065718A3 Wireless power and communications cross-bar switch |
| 03/28/2002 | US20020036087 Method and apparatus for gravel packing with a tool that maintains a pressure in a target wellbore section |
| 03/28/2002 | US20020036085 Toroidal choke inductor for wireless communication and control |
| 03/27/2002 | EP1190156A2 Downhole apparatus |
| 03/21/2002 | WO2002023007A1 Liner hanger with sliding sleeve valve |
| 03/21/2002 | WO2001081801A3 Combination poppet and gate valve |
| 03/21/2002 | WO2001073260A3 Multiport gate valve assembly |
| 03/21/2002 | WO2001061148A3 Filter cake cleanup and gravel pack methods for oil based or water based drilling fluids |
| 03/21/2002 | US20020033262 Multi-purpose float equipment and method |
| 03/21/2002 | DE10125369A1 Hydraulische Unterwasserkupplung mit Führung für ein Ventilstellglied Hydraulic coupling with guide for a valve actuator |
| 03/20/2002 | EP1187967A1 Actuator |
| 03/19/2002 | US6359569 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 03/19/2002 | US6357722 Undersea hydraulic coupling with guide for valve actuator |
| 03/19/2002 | US6357529 Subsea completion system with integral valves |
| 03/14/2002 | WO2002020942A1 Hydraulic control system for downhole tools |
| 03/14/2002 | WO2002020939A1 Method and system for perforating |
| 03/14/2002 | US20020029890 Isolation valve |
| 03/14/2002 | US20020029889 Deviated borehole drilling assembly |
| 03/14/2002 | US20020029887 Tubing hanger shuttle valve |
| 03/14/2002 | US20020029886 Wellbore flow control device |
| 03/14/2002 | US20020029883 System and method for fluid flow optimization |
| 03/13/2002 | EP1042585B1 Method and apparatus for cementing casing in a wellbore |
| 03/13/2002 | CN2481845Y Thermal insulating arrangement for christmas tree |
| 03/13/2002 | CN1080805C 活塞阀 Piston valve |
| 03/12/2002 | US6354378 Method and apparatus for formation isolation in a well |
| 03/07/2002 | WO2002018743A1 Multi zone isolation tool and method for subterranean wells |
| 03/07/2002 | US20020027003 Hydraulic control system for downhole tools |
| 03/07/2002 | US20020027002 Downhole flow control devices |
| 03/06/2002 | CN2480254Y Combined hydraulic pump station |
| 03/06/2002 | CN1339082A Multilateral well and electrical transmission system |
| 03/05/2002 | US6352239 Gate valve actuator override mechanism |
| 03/05/2002 | US6352119 Completion valve assembly |
| 03/05/2002 | US6352118 System and method for communication hydraulic control to a wireline retrievable downhole device |
| 02/28/2002 | WO2002016730A1 Flow control device |
| 02/28/2002 | US20020023759 Method and apparatus of operating devices using actuators having expandable or contractable elements |
| 02/28/2002 | US20020023758 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023757 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023756 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023747 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023745 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023532 System for remote control and operation |
| 02/28/2002 | US20020023505 Apparatus for passive removal of subsurface contaminants and volume flow measurement |
| 02/27/2002 | EP1182422A1 Position measurement with spring and force measurement for actuators, BOP, valves |
| 02/27/2002 | EP1181434A1 Valve with secondary load bearing surface |
| 02/27/2002 | CN2479200Y Downhole multistage layer work string sliding valve |
| 02/27/2002 | CN2479199Y Multiple-circulation valve |
| 02/27/2002 | CN2479198Y Pressure testing control valve for rod pump tubing string |
| 02/27/2002 | CN2479197Y Steam-filling and oil drain duel-purpose valve |
| 02/27/2002 | CN2479196Y Two-way diverting oil-pipe valve |
| 02/27/2002 | CN2479195Y Pumping wellhead device |
| 02/27/2002 | CN2479194Y Frost valve |
| 02/27/2002 | CN2479193Y Anti-theft motorized valve device |
| 02/26/2002 | US6349767 Disconnect tool |
| 02/26/2002 | US6349766 Chemical actuation of downhole tools |
| 02/26/2002 | US6349763 Electrical surface activated downhole circulating sub |
| 02/21/2002 | WO2002014650A1 Activating ball assembly for use with a by-pass tool in a drill string |
| 02/21/2002 | WO2001073325A3 Gate valve |
| 02/21/2002 | US20020020535 Reservoir communication with a wellbore |
| 02/21/2002 | US20020020534 Flow control device |
| 02/21/2002 | US20020020533 Production well telemetry system and method |
| 02/21/2002 | US20020020531 Method and apparatus for cementing branch wells from a parent well |
| 02/20/2002 | CN2477820Y Integrated anti-theft oil extracting wellhead appts. |
| 02/20/2002 | CN2477819Y Anti-theft oil extracting wellhead |
| 02/14/2002 | US20020017384 Valve assembly for hydrocarbon wells |
| 02/13/2002 | EP1179116A1 Recovery of production fluids from an oil or gas well |
| 02/13/2002 | CN2476640Y Underground plugging device |
| 02/12/2002 | US6345668 Tubing hanger having an integral valve gate |
| 02/07/2002 | WO2002010546A2 Method and apparatus for formation damage removal |
| 02/07/2002 | US20020014338 Hydraulically operated fluid metering apparatus for use in a subterranean well |
| 02/07/2002 | US20020014268 Reciprocating pump standing head valve |
| 02/06/2002 | CN2475827Y A controllable discharge oil valve for oil well sampling and valve opening implement |
| 02/05/2002 | US6343658 Underbalanced well completion |
| 02/05/2002 | US6343651 Apparatus and method for controlling fluid flow with sand control |
| 02/05/2002 | US6343649 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 01/31/2002 | WO2002008561A2 Improvements in valves |
| 01/31/2002 | WO2001040614A3 Ceramic components for high pressure oil wells |
| 01/31/2002 | WO2000053885A3 Downhole apparatus |
| 01/31/2002 | US20020011341 Pack-off system |
| 01/31/2002 | US20020011336 Crossover tree system |
| 01/31/2002 | CA2415955A1 Improvements in valves |
| 01/30/2002 | EP1175549A1 Rotating blowout preventer |
| 01/30/2002 | CN2474715Y Pressure difference adjustable self grouting jacket pipe back pressure valve |
| 01/24/2002 | WO2002006593A1 Sand screen with integrated sensors |
| 01/24/2002 | WO2001065049A3 Cavitating jet |
| 01/24/2002 | US20020007951 Well flow controller |
| 01/24/2002 | US20020007950 Valves |